Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccb5221bdee1682…

MALICIOUS

PDF

117.9 KB Created: 2021-06-29 18:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e68dd51011f94fa0f63e4284d2ee2fae SHA-1: abc12ac9b5c82019f1bede5dbe1dae66fc4c9263 SHA-256: 8ccb5221bdee1682a948d9766217888e4823fca42cd1cf789e1525fdee63f69c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=sura+guide+for+12th+computer+science+pdf+download PDF link annotation
    • http://phuocthuan.vn/images/pic/file/vakenefaruxete.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v6nlujde09mkcfhomusf97bsp1/84927398389.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086402b1cfdd---zovakitamiben.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/v9pqmc2in31rfq9u2ok8jf7ght/bofajerapupiwelurubogodi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ra6vn80542384j0lgh8dp3q1vi/81772087614.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3e7b5995f74f01dbe7e93361d30bb276/wawukedijisog.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/55340101aec51af730f695acc8edca4c/66759726262.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4826d7b3b---50082668068.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ecb52b9cfded110d2f913460ff698ec8/53887544563.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160899972adbfc---69428625803.pdfIn PDF document text
    • http://kco.su/userfiles/file/87725515250.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081024e236a8---venaxukegos.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0809a9e5d---nopabuxusepowivosabiwi.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210612_52E6714CF2DB1515.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/09bb1e9cc58f20a2030105efba856aca/woligututurafunogig.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xuzokow.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/91485830129.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5ad89c86---63259698885.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/67694120406.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/vovip.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/xikitalubawo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/qstho6u7f972vd43vsc4uh4ns3/73590388279.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/40728256557.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec77ac1a---60727405072.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001682a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1682A 11500 bytes
SHA-256: 1890b431286f0dfde9a942e48f2a9eb4a060e4ce15db86736a04243504204add
font_01_sfnt_off00018323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B35 16964 bytes
SHA-256: b1473bd41256826aabedefbd7831c24cf537c8e0a4b69d5d1d301d32e5139655

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